Alternator is not running, 12 volt reading verses 14 volt reading. If anything, the temp should go up do to heat soak when engine is just turned off off.
Then again too, depends where the sender is located, if in the head, alot of heat soak. If in the intake crossover next to the thermostat, not as much heat soak.
Also, electrical connections, could need cleaning. The thermistor body is grounded through the threads, heat does change resistance, usually, higher heat, more resistance. DMM won't show this amount, one would have to measure with a DMM having the function of Low Ohms, >2 ohms (milliohms) measurement, as in 4-wire meter leads.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...